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基于Co3O4修饰SnO2纳米纤维的高响应和高选择性乙醇气体传感器
陈冬冬,李洲,金鑫,易建新*
作者单位E-mail
陈冬冬 中国科学技术大学安全科学与工程系, 火灾科学国家重点实验室, 合肥 230026  
李洲 中国科学技术大学安全科学与工程系, 火灾科学国家重点实验室, 合肥 230026  
金鑫 中国科学技术大学安全科学与工程系, 火灾科学国家重点实验室, 合肥 230026  
易建新* 中国科学技术大学安全科学与工程系, 火灾科学国家重点实验室, 合肥 230026 yjx@ustc.edu.cn 
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DOI:10.1063/1674-0068/30/cjcp1704080
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基金项目:This work was supported by the National Natural Science Foundation of China (No.U1432108) and the Fundamental Research Funds for the Central Universities (No.WK2320000034).
Highly Responsive and Selective Ethanol Gas Sensor Based on Co3O4-Modified SnO2 Nanofibers
Dong-dong Chen,Zhou Li,Xin Jin,Jian-xin Yi*
Abstract:
SnO2 nanofibers were synthesized by electrospinning and modified with Co3O4 via impregnation in this work. Chemical composition and morphology of the nanofibers were systematically characterized, and their gas sensing properties were investigated. Results showed that Co3O4 modification significantly enhanced the sensing performance of SnO2 nanofibers to ethanol gas. For a sample with 1.2 mol% Co3O4, the response to 100 ppm ethanol was 38.0 at 300℃, about 6.7 times larger than that of SnO2 nanofibers. In addition, the response/recovery time was also greatly reduced. A power-law dependence of the sensor response on the ethanol concentration as well as excellent ethanol selectivity was observed for the Co3O4/SnO2 sensor. The enhanced ethanol sensing performance may be attributed to the formation of p-n heterojunctions between the two oxides.
Key words:  SnO2 nanofibers  Heterojunction  Electrospinning  Impregnation  Gas sensors